Final answer:
The traffic lights used in Edmonton, ordered from highest energy to lowest, are green, yellow, and red. The energy of light decreases with increasing wavelength. Blue light has the highest energy compared to yellow and red when considering both frequency and wavelength.
Step-by-step explanation:
To arrange the traffic lights used in Edmonton, which are green, yellow, and red, in order from highest energy to lowest, we need to consider the properties of visible light. The energy of light is inversely proportional to its wavelength, meaning that shorter wavelengths correspond to higher energy and longer wavelengths correspond to lower energy.
The correct order, starting with the highest energy, is: green, yellow, and red. This is because green light has a shorter wavelength (around 495-570 nm) compared to yellow (around 570-590 nm) and red (around 620-750 nm) in the visible spectrum.
Similarly, when considering light waves such as yellow, blue, and red, the order according to wavelength from shortest to longest is: blue, yellow, and red. Conversely, when ordering by frequency from lowest to highest, the order would be reversed: red, yellow, and blue.
For four stars in the night sky (red, yellow, orange, and blue), the photons from the blue star will carry the greatest amount of energy due to having the shortest wavelength/higher frequency in the visible spectrum.